CN110736551A - large-area source blackbody radiation source based on gas-liquid two-phase backflow temperature control - Google Patents
large-area source blackbody radiation source based on gas-liquid two-phase backflow temperature control Download PDFInfo
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- 239000007788 liquid Substances 0.000 title claims abstract description 170
- 230000005457 Black-body radiation Effects 0.000 title claims abstract description 43
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- 238000010992 reflux Methods 0.000 claims description 27
- 230000017525 heat dissipation Effects 0.000 claims description 10
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims description 10
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- 238000012360 testing method Methods 0.000 description 4
- 238000009529 body temperature measurement Methods 0.000 description 3
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- 230000008014 freezing Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/0003—Radiation pyrometry, e.g. infrared or optical thermometry for sensing the radiant heat transfer of samples, e.g. emittance meter
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/02—Constructional details
- G01J5/026—Control of working procedures of a pyrometer, other than calibration; Bandwidth calculation; Gain control
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/10—Radiation pyrometry, e.g. infrared or optical thermometry using electric radiation detectors
- G01J5/20—Radiation pyrometry, e.g. infrared or optical thermometry using electric radiation detectors using resistors, thermistors or semiconductors sensitive to radiation, e.g. photoconductive devices
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Abstract
The invention discloses surface source black body radiation sources based on gas-liquid two-phase backflow temperature control, which comprises a large surface source black body, a supporting base plate, a gas-liquid two-phase backflow device and a supporting framework, wherein the large surface source black body, the supporting base plate and the gas-liquid two-phase backflow device are supported by the supporting framework, the large surface source black body is supported by the supporting base plate, and the gas-liquid two-phase backflow device is positioned below the supporting base plate.
Description
Technical Field
The invention relates to the technical field of infrared remote sensing external field radiometric calibration application, in particular to large-area source blackbody radiation sources based on gas-liquid two-phase backflow temperature control.
Background
The blackbody is ideal objects, the emissivity and absorptivity of which are both 1, i.e. the blackbody can absorb all the radiation of all the wavelengths at any temperature and can emit the radiation to the maximum extent, in reality, no ideal blackbody exists, the radiation of a small hole opened on closed cavities can be regarded as blackbody radiation, the emissivity of which is very close to 1, and such cavities are called blackbody cavities, in practical application, the blackbody cavities are used as blackbody radiation sources for infrared temperature measurement, infrared camera calibration and the like, and is widely applied to various infrared devices.
The radiation source is the main aspect influencing the precision and the resolution of the infrared device, the traditional radiation source uses a simple blackbody cavity, and the traditional radiation source is generally in the shape of a simple cylinder, a cone, a double cone, a cylinder-cone and a cylinder-inner convex cone which are equiaxial symmetrical cavities due to the restriction of an analysis method, equipment and a process, and the blackbody cavity is usually small in opening and suitable for working under the conditions of medium and high temperature and is called a point source blackbody. With the rapid development of infrared technology, the surface of the radiation source is made into a complex surface (such as V-shaped pyramid and honeycomb surfaces), which is called a surface radiation source. The surface radiation source has great application in the technologies of infrared temperature measurement, infrared imaging, infrared camera calibration and the like, and can meet the requirements of large surface source size, high precision and high radiance for an infrared system.
In recent years, in order to meet the development requirement of large aperture and large field angle of infrared detectors, large surface source black bodies have been developed rapidly, so that the analysis and research of surface radiation sources become more and more important, national space agency (NASA) of the united states equips surface black body radiation sources on earth detection satellites (Terra) for high resolution correction of stereo multispectral imagers, research on surface radiation source black bodies in many countries such as the united states, canada, russia, etc. foreign surface radiation source manufacturers mainly include EO corporation, MIKKION corporation, HGH corporation, alling corporation, etc. all of which produce blackbody radiation sources having substantially the same structure, whereas blackbodies below ambient temperature such as are cooled by liquid oxygen in vacuum, and temperature control methods under normal pressure are mostly performed by using liquid oxygenA resistance heating mode based on platinum resistance temperature measurement. The temperature control mode improves the temperature range and precision of the surface source black body, but the system structure is complex, and only the temperature control higher than the environment temperature can be realized, so that the requirement that the outdoor temperature is more than 1m is difficult to meet2The requirement of accurate temperature control in constant temperature range of the large-area source black body can not ensure the temperature property and uniformity of the surface temperature of the large-area source black body.
Therefore, it is necessary to further study the realization of the emissivity of the radiation calibration blackbody structure design and the temperature control technology of the blackbody radiation surface according to the requirements of infrared and high spectral load high-precision radiation calibration on high emissivity of the large surface source blackbody source and high uniformity standard test of surface temperature of the surface source blackbody source.
Disclosure of Invention
The invention provides surface source black body radiation sources based on gas-liquid two-phase reflux temperature control, which have the characteristics of high emissivity, large surface source and the like, and the gas-liquid two-phase reflux temperature control ensures that the large surface source black body radiation sources are not limited by the field environment to realize accurate temperature control within a fixed temperature range of , thereby meeting the requirements of high-spectrum and infrared load high-accuracy external field radiation calibration on high emissivity and high uniformity standard test targets.
Therefore, the invention adopts the following technical scheme:
example :
, as shown in fig. 1, the surface source blackbody radiation source includes a large surface source blackbody 1, a support base plate 2, a gas-liquid two-phase reflux device 3 and a support framework 4, the support base plate 2 and the gas-liquid two-phase reflux device 3 are both supported by the support framework 4, the large surface source blackbody 1 is supported by the support base plate 2, the gas-liquid two-phase reflux device 3 is located under the support base plate 2, the large surface source blackbody 1 includes 1 sub blackbody assembly 11, the sub blackbody assembly 11 is sequentially provided with a blackbody surface source plate 111, a back plate 112 and a temperature equalizing plate 113 from top to bottom as shown in fig. 2, the temperature equalizing plate 113 is provided with a heat dissipation channel 1131 which is arranged in a balanced manner as shown in fig. 3, both sides of the temperature equalizing plate 113 are provided with a liquid inlet channel 1133 and a liquid outlet channel manifold 1133 which are communicated with the heat dissipation channel 1131, the liquid inlet 1134 is arranged in the middle of the liquid inlet channel 1133, the liquid outlet 1134 is arranged in the middle of the liquid channel 1133, the liquid outlet 1133 is provided with a liquid inlet 11331, a liquid inlet 1134, a liquid inlet 11331 of a liquid pipeline 31 which is sequentially connected to a liquid recirculation unit 31, a liquid recirculation hose 6332 of a liquid recirculation unit, a liquid recirculation hose 35, a liquid heater, a liquid recirculation hose 35 of a liquid heater, a liquid inlet 1134, a liquid inlet 35, a liquid recirculation unit which is;
as shown in fig. 4, the working medium flows through the heat exchanger 32, the refrigeration unit 33, the reservoir 34, the filter 35, the circulation pump 36, the heat regenerator 37, the preheater 38, the liquid inlet fluid hose 1136 to the liquid inlet 1134 of the temperature equalizing plate 113 of the sub-black body assembly 11, the liquid inlet fluid hose 1132 to the heat dissipation channel 1131, the liquid outlet manifold 1133 to the liquid outlet 1135 of the temperature equalizing plate, the liquid outlet fluid hose 1137 to flow back to the heat regenerator 37 along the fluid pipe 31, and then the working medium is recirculated to the heat exchanger 32 and the refrigeration unit 33 to form a circulation loop, thereby realizing the temperature control of the large-area black body source radiation source.
The working medium is driven by the pressure of a circulating pump 36 to be in liquid form, -level temperature control is carried out along a fluid pipeline 31 through a heat exchanger 32 and a refrigerating unit 33, the target temperature fluctuation is stabilized within +/-1 ℃, secondary temperature control is carried out through a liquid storage device 34, the target temperature fluctuation is stabilized within +/-0.5 ℃, the temperature of the working medium is attenuated through a heat regenerator 37, the target temperature fluctuation stability is stabilized within +/-0.3 ℃, finally, tertiary temperature control is carried out through a preheater 38, the target temperature fluctuation stability is stabilized within +/-0.1 ℃, the working medium fluid is converted from liquid phase into gas-liquid two phase, the working medium fluid is dispersed to a temperature equalizing plate 113 liquid inlet 1134 of a sub-black body assembly 11 through a liquid inlet fluid hose 1136, is dispersed to a heat dissipation flow channel 1131 through a liquid outlet manifold channel 1133 to a temperature equalizing plate 113 liquid outlet 1135, is concentrated through a liquid outlet fluid hose 1137 and then flows back to the heat regenerator 37 through the liquid pipe 31, and is recycled to the heat exchanger 31 and the refrigerating unit 32, and the working.
The working medium is selected according to the temperature control range required by the surface source black body radiation source, and proper flow and working temperature are preset, wherein the preset working temperature range of the working medium is as follows: -60 ℃ to +90 ℃; the controllable temperature range of the large-area source blackbody radiation source realized through gas-liquid two-phase backflow is as follows: working medium working temperature-working temperature +/-30 ℃.
As shown in fig. 2, the surface of the black body surface source plate 111 is processed by grooving to form a micro pyramid arrangement, and the cone angle is 30 ° to 60 °, preferably 45 °.
As shown in fig. 2 and 3, a plurality of temperature sensors 114 are arranged outside and in the center of the sub-blackbody assembly 11, and the temperature sensors 114 are embedded into the back plate 112 and the temperature equalizing plate 113 through mounting holes and are close to the blackbody panel 111; heat-conducting silicon rubber is filled in the mounting hole; the temperature sensors 114 are preferably 5, 4 are uniformly distributed at the outer side of the sub-blackbody assembly 1, and 1 is located at the central position; the temperature sensor 114 is preferably a platinum resistor.
As shown in fig. 4, a plurality of pressure sensors 310 are further disposed in the fluid pipeline 31 loop of the gas-liquid two-phase reflux device 3, and are used for monitoring the pressure at various positions of the gas-liquid two-phase reflux device.
Wherein, a liquid level sensor 341 is arranged in the liquid reservoir 34 for monitoring the liquid level in the liquid reservoir.
The back plate 12 is made of a high thermal conductive material, preferably an aluminum alloy material.
Example two
, as shown in fig. 5, the surface source blackbody radiation source includes a large surface source blackbody 1, a support base plate 2, a gas-liquid two-phase reflux device 3 and a support framework 4, the support base plate 2 and the gas-liquid two-phase reflux device 3 are both supported by the support framework 4, the large surface source blackbody 1 is supported by the support base plate 2, the gas-liquid two-phase reflux device 3 is located under the support base plate 2, the large surface source blackbody 1 includes 3 sub blackbody assemblies 11, the sub blackbody assemblies 11 are sequentially provided with a blackbody surface source plate 111, a back plate 112 and a temperature equalizing plate 113 from top to bottom as shown in fig. 2, the temperature equalizing plate 113 is provided with a heat dissipation channel 1131 which is arranged in a balanced manner as shown in fig. 3, both sides of the temperature equalizing plate 113 are provided with a liquid inlet channel 1133 and a liquid outlet channel manifold 1133 which are communicated with the heat dissipation channel 1131, the liquid inlet 1134 is provided in the middle of the liquid inlet channel 1133, the liquid outlet 1135 is provided in the middle of the liquid channel 1133, the gas-liquid reflux device 3 includes a liquid inlet channel 11331, a liquid inlet 11332 connected to a liquid circulating pump 35 of a liquid preheater 35, a liquid inlet 35 connected with a liquid inlet of a liquid heater unit 35, a liquid inlet 35 connected in sequence, a liquid inlet of a liquid inlet 11332, a liquid inlet 35, a liquid inlet, a;
as shown in fig. 6, the working medium flows through the heat exchanger 32, the refrigeration unit 33, the reservoir 34, the filter 35, the circulation pump 36, the heat regenerator 37, the preheater 38, the liquid inlet fluid hose 1136 to the liquid inlet 1134 of the temperature equalizing plate 113 of each sub-black body assembly 11, the liquid inlet fluid hose 1132 to the heat dissipation channel 1131, the liquid outlet manifold 1133 to the liquid outlet 1135 of the temperature equalizing plate, the liquid outlet fluid hose 1137 to flow back along the fluid pipe 31 to the heat exchanger 32 and the refrigeration unit 33, so as to form a circulation loop, thereby achieving the temperature control of the large-area heat-regenerating radiation source black body.
The working medium is driven by the pressure of a circulating pump 36 to be in liquid form, subjected to -level temperature control through a heat exchanger 32 and a refrigerating unit 33 along a fluid pipeline 31 to enable target temperature fluctuation to be stable within +/-1 ℃, subjected to secondary temperature control through a liquid storage device 34 to enable the target temperature fluctuation to be stable within +/-0.5 ℃, subjected to temperature attenuation through a heat regenerator 37 to enable the target temperature fluctuation stability to be stable within +/-0.3 ℃, subjected to tertiary temperature control through a preheater 38 to enable the target temperature fluctuation stability to be stable within +/-0.1 ℃, converted from liquid phase to gas-liquid two phase, dispersed to a liquid inlet 1134 of a temperature equalizing plate 113 of each sub-black body assembly 11 through a liquid inlet fluid hose 1136, dispersed to a heat dissipation flow channel 1131 through a liquid outlet manifold channel 1133 to a liquid outlet 1135 of the temperature equalizing plate 113, concentrated through a liquid hose 1137, returned to the heat regenerator 37 through the liquid pipe 31, and recycled to the heat exchanger 31 and the refrigerating unit 32, and converted from the gas-liquid two-phase to the liquid phase to form a circulating loop.
The working medium is selected according to the temperature control range required by the surface source black body radiation source, and proper flow and working temperature are preset, wherein the preset working temperature range of the working medium is as follows: -60 ℃ to +90 ℃; the controllable temperature range of the large-area source blackbody radiation source realized through gas-liquid two-phase backflow is as follows: working medium working temperature-working temperature +/-30 ℃.
As shown in fig. 2, the surface of the black body surface source plate 111 is processed by grooving to form a micro pyramid arrangement, and the cone angle is 30 ° to 60 °, preferably 45 °.
As shown in fig. 2 and 3, a plurality of temperature sensors 114 are arranged outside and in the center of the sub-blackbody assembly 11, and the temperature sensors 114 are embedded into the back plate 112 and the temperature equalizing plate 113 through mounting holes and are close to the blackbody panel 111; heat-conducting silicon rubber is filled in the mounting hole; the temperature sensors 114 are preferably 5, 4 are uniformly distributed at the outer side of the sub-blackbody assembly 1, and 1 is located at the central position; the temperature sensor 114 is preferably a platinum resistor.
As shown in fig. 6, a plurality of pressure sensors 310 are further disposed in the fluid pipeline 31 of the gas-liquid two-phase reflux device 3 for monitoring the pressure at various positions of the gas-liquid two-phase reflux device.
Wherein, a liquid level sensor 341 is arranged in the liquid reservoir 34 for monitoring the liquid level in the liquid reservoir.
The back plate 12 is made of a high thermal conductive material, preferably an aluminum alloy material.
The sub-blackbody assembly 11 is spliced by the splicing assembly 12 to form a large surface source blackbody, and the gap at the splicing seam is not more than 2 mm.
The invention adopts the technical scheme, adopts a gas-liquid two-phase backflow temperature control mode to improve the temperature range and precision of the surface source black body, has simple system structure, can form a large surface source black body radiation source by splicing a plurality of sub black body components, sets proper flow and temperature of working medium fluid, and then connects the large surface source black body radiation source with the liquid inlet of the temperature equalizing plate of each sub black body component through the fluid hose to carry out shunting, ensures that the working medium fluid is uniformly and stably dispersed to the temperature equalizing plate, simultaneously utilizes the heat regenerator to effectively exchange heat between the liquid inlet and the liquid outlet of the temperature equalizing plate, well attenuates the temperature fluctuation of the working medium, ensures that the large surface source black body radiation source is not limited by the field environment to realize accurate temperature control in constant temperature range, ensures the stability and uniformity of the temperature of the large surface source black body radiation source, and has the characteristics of high emissivity, high-precision.
Drawings
Fig. 1 is a schematic external structural diagram of a planar blackbody radiation source based on gas-liquid two-phase reflux temperature control according to embodiment of the present invention.
FIG. 2 is a schematic view of the surface source blackbody radiation source blackbody assembly structure based on gas-liquid two-phase reflux temperature control
FIG. 3 is a schematic diagram of a temperature-equalizing plate structure of a surface source blackbody radiation source blackbody assembly based on gas-liquid two-phase reflux temperature control
FIG. 4 is a schematic diagram of a gas-liquid two-phase reflux device of a surface source blackbody radiation source based on gas-liquid two-phase reflux temperature control and connection thereof with a sub-blackbody assembly temperature-equalizing plate according to embodiment of the present invention
FIG. 5 is a schematic diagram of an external structure of a planar blackbody radiation source based on gas-liquid two-phase reflux temperature control according to a second embodiment of the present invention
FIG. 6 is a schematic diagram of a gas-liquid two-phase reflux device of a surface source blackbody radiation source based on gas-liquid two-phase reflux temperature control and connection between the gas-liquid two-phase reflux device and a temperature-equalizing plate of a sub-blackbody assembly according to an embodiment of the present invention
Detailed Description
In order that the objects, features and advantages of the present invention will become more apparent, specific embodiments of the invention are set forth in more detail in the following description, in which many specific details are set forth in order to provide a thorough understanding of the invention, but the invention can be practiced in many ways other than those described and therefore the invention is not limited to the specific embodiments disclosed below.
The specific implementation method is given according to the structural characteristics and functions of the large-area blackbody radiation source with the design area of 3m multiplied by 3m as an example:
the large-area source black body of 3m multiplied by 3m is formed by splicing 1m multiplied by 1m square sub black body assemblies according to a 3 x 3 mode through splicing assemblies, a liquid inlet of a temperature equalizing plate of each sub black body assembly is connected to ends of a fluid pipeline through a liquid inlet fluid hose, a liquid outlet of each sub black body assembly is connected to the other ends of the fluid pipeline through a liquid outlet fluid hose, a working medium uniformly disperses to the liquid inlet of the temperature equalizing plate of each sub black body assembly through the liquid inlet fluid hose along the fluid pipeline through a heat exchanger, a refrigerating unit, a liquid storage device, a filter, a circulating pump, a heat regenerator and a preheater, disperses to a heat dissipation flow channel through a liquid inlet dispersion flow channel, then flows to the liquid outlet of the temperature equalizing plate through a liquid collecting channel, and then flows back to the heat regenerator along the fluid pipeline through the liquid outlet fluid hose in a centralized mode, and then is recycled to the heat exchanger and.
The Freon R134a is used as a working medium, dp/dt is 19kPa, the pressure difference between an inlet and an outlet of the temperature-equalizing plate is controlled within 7.6kPa, temperature uniformity is better than +/-0.2 ℃, and the technical requirements can be met, and meanwhile, the R134a freezing point temperature is-103.3 ℃, the critical temperature is 101.06 ℃, and the use requirements in a temperature range of-30 ℃ to +90 ℃ are met.
The flow resistance of the whole system is composed of the flow resistance of the equipment connected in series by the pipeline flow resistance, and the flow resistance of the equipment comprises the flow resistance of a heat regenerator, a preheater, a temperature equalizing plate, a refrigerating unit and a filter except the flow resistance of a guide pipe and a relevant joint. The flow resistance of the guide pipe can be reasonably distributed according to the proper pipe diameter, the flow resistance of the equipment can be obtained according to the selected model specification, and finally the flow resistance is obtained by adding the parts. Wherein, the fluid pipeline adopts a stainless steel pipe phi 54 multiplied by 2 pipeline to meet the requirement.
The total volume of the liquid storage device ensures that constant working media still exist when the loop operates within a designed working temperature range under a low-temperature working condition, and the liquid amount in the liquid storage device does not fill the whole system under a high-temperature working condition, so that the test of the pump-driven fluid loop test can be ensured to be carried out smoothly, the safety of the whole system can be ensured, and the working media in the liquid storage device are in a gas-liquid coexisting state under any working condition when the circulating pump-driven loop operates, so that the temperature control function of the fluid loop is realized.
The platinum resistor is PT1000, the PT1000 sensor is sensitive to temperature, the resistance value is 1000 ohms at 0 ℃, the resistance value changes by 0.1 ℃ and about 0.4 ohms at 0 ℃, and the linearity is good.
The technical scheme is adopted to obtain the 3m × 3m large-area blackbody radiation source, and the large-area blackbody radiation source has the following performance that the working temperature is-30 ℃ to +60 ℃, the controllable temperature range is that the working temperature is-30 ℃, the emissivity is more than or equal to 0.98, the temperature resolution is less than or equal to 0.1K, the temperature control stability is +/-0.2K/30 Min, and the temperature uniformity is +/-0.3K.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
- The surface source black body radiation source based on gas-liquid two-phase backflow temperature control is characterized by comprising a large surface source black body, a supporting bottom plate, a gas-liquid two-phase backflow device and a supporting framework, wherein the supporting bottom plate and the gas-liquid two-phase backflow device are supported by the supporting framework, the large surface source black body is supported by the supporting bottom plate, the gas-liquid two-phase backflow device is positioned below the supporting bottom plate, the large surface source black body comprises a plurality of sub black body components, the sub black body components are sequentially provided with a black body surface source plate, a back plate and a temperature-equalizing plate from top to bottom, the temperature-equalizing plate is provided with radiating flow channels which are arranged in a balanced mode, liquid inlet radiating flow channels and liquid outlet flow channels which are communicated with the radiating flow channels are arranged on two sides of the temperature-equalizing plate, a liquid inlet is arranged in the middle of each liquid inlet radiating flow channel, a liquid outlet is arranged in the middle of each liquid outlet flow channel, the gas-liquid two-phase backflow device comprises a fluid pipeline, and a heat exchanger, a refrigerating unit, a liquid reservoir, a filter, a circulating pump, a heat regenerator and a liquid outlet, a liquid outlet and a liquid outlet pre-heater which;working medium evenly disperses through a liquid inlet fluid hose to a liquid inlet of a temperature equalizing plate of each sub-black body assembly along a fluid pipeline, disperses to a heat dissipation flow channel through a liquid inlet dispersion flow channel, then flows to a liquid outlet of the temperature equalizing plate through a liquid outlet flow channel, and circulates to the heat exchanger and the refrigerating unit after passing through the liquid outlet fluid hose and then flowing back through the heat regenerator along the fluid pipeline, so that a circulation loop is formed, and the temperature control of the large-area source black body radiation source is realized.
- 2. The large-area source blackbody radiation source based on gas-liquid two-phase backflow temperature control is characterized in that working medium is driven by a circulating pump to be in liquid form to be subjected to -level temperature control through a heat exchanger and a refrigerating unit along a fluid pipeline under the pressure so that the target temperature fluctuation is stabilized within +/-1 ℃, then is subjected to secondary temperature control through a liquid storage device so that the target temperature fluctuation is stabilized within +/-0.5 ℃, is subjected to temperature attenuation through a heat regenerator so that the target temperature fluctuation stability is stabilized within +/-0.3 ℃, finally is subjected to tertiary temperature control through a preheater so that the target temperature fluctuation stability is stabilized within +/-0.1 ℃, and at the moment, the working medium fluid is converted into gas-liquid two phases from a liquid phase, is dispersed to a temperature equalizing plate liquid inlet of a sub-blackbody assembly through a fluid inlet dispersion flow channel, is dispersed to a heat dispersion flow channel, is then to a temperature equalizing plate liquid outlet through a fluid collecting channel, is concentrated through a fluid hose, and then flows back to the heat regenerator through the heat exchanger and the refrigerating unit.
- 3. The large-area source blackbody radiation source based on gas-liquid two-phase reflux temperature control according to claim 1, wherein the working medium is selected according to a temperature control range required by the surface source blackbody radiation source and preset with a proper flow and working temperature, the preset working temperature range of the working medium is-60 ℃ to +90 ℃, and the controllable temperature range of the large-area source blackbody radiation source realized through gas-liquid two-phase reflux is that the working temperature of the working medium is-30 ℃.
- 4. The large-area blackbody radiation source based on gas-liquid two-phase backflow temperature control according to claim 1, wherein the surface of the blackbody surface source plate is grooved to form a micro-pyramid arrangement with a cone angle of 30-60 degrees, preferably 45 degrees.
- 5. The large-area source blackbody radiation source based on gas-liquid two-phase backflow temperature control according to claim 1, wherein a plurality of temperature sensors are arranged on the outer side and the center of the sub blackbody assembly, the temperature sensors are embedded into the back plate and the temperature equalizing plate through mounting holes and are close to the blackbody source plate, and heat-conducting silicon rubber is filled in the mounting holes.
- 6. The large-area blackbody radiation source based on gas-liquid two-phase backflow temperature control according to claim 5, wherein the number of the temperature sensors is preferably 5, 4 temperature sensors are uniformly distributed on the outer side of the sub blackbody assembly, and 1 temperature sensor is located at the center, and the temperature sensors are preferably platinum resistors.
- 7. The large-area source blackbody radiation source based on gas-liquid two-phase reflux temperature control according to claim 1, wherein a plurality of pressure sensors are further arranged in the fluid pipeline loop of the gas-liquid two-phase reflux device and used for monitoring the pressure at each position of the gas-liquid two-phase reflux device.
- 8. The large-area source blackbody radiation source based on gas-liquid two-phase backflow temperature control according to claim 1, wherein a liquid level sensor is arranged in the reservoir and used for monitoring the liquid level in the reservoir.
- 9. The large-area source blackbody radiation source based on gas-liquid two-phase backflow temperature control according to claim 1, wherein the back plate is made of a high thermal conductive material, preferably an aluminum alloy material.
- 10. The large-area source blackbody radiation source based on gas-liquid two-phase backflow temperature control according to claim 1, wherein the sub-blackbody assemblies are spliced with a large-area source blackbody through a splicing assembly, and a gap at the splicing seam is not more than 2 mm.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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